P0197
Fix within 1-2 weeksThe engine computer detects that the engine oil temperature sensor is reporting an extremely low temperature, indicating a problem with the sensor or its circuit.
Code P0197 means your engine oil temperature sensor is reporting an extremely low temperature. Common causes: Faulty sensor (80%), wiring issues (15%). Drivability: Yes, safe to drive. Repair cost: $50-$100 DIY, $150-$300 professional.
Can I Drive With P0197?
Yes, safe to drive
No restrictions, but fix within 1-2 weeks to prevent other issues.
Stop driving immediately if: Flashing CEL, loud noises, burning smell, significant power loss
Symptoms of P0197
- 1Check Engine Light is on
- 2Incorrect or no oil temperature gauge reading
- 3Engine fan runs constantly
- 4Reduced fuel economy
- 5Engine runs rich (smells like fuel)
Common Causes of P0197
Parts most likely causing this code, ranked by probability
The sensor itself has failed internally, sending an incorrect low voltage signal to the engine computer.
80% of P0197 cases are fixed by replacing this part
Damaged, corroded, or loose wiring or a faulty connector prevents the correct signal from reaching the engine computer.
15% of P0197 cases are fixed by repairing wiring or connector
A rare internal fault within the engine computer's sensor input circuit causes it to misinterpret the oil temperature signal.
5% of P0197 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the oil temperature sensor's electrical connector and wiring for any obvious damage, corrosion, or looseness.
- Ensure your engine oil level is correct and the oil is not excessively dirty, though this is less likely to cause P0197 directly.
How to Diagnose P0197
- 1Visually inspect the engine oil temperature sensor and its electrical connector for any signs of damage, corrosion, or loose connections.
- 2Using a multimeter, test the resistance of the oil temperature sensor. Compare readings to factory specifications at various temperatures (if possible).
- 3Check for proper reference voltage (usually 5V) and ground at the sensor connector with the ignition on.
- 4Inspect the wiring harness leading to the sensor for any chafing, cuts, or breaks, especially where it passes near hot engine components or sharp edges.
P0197 on Popular Vehicles
Ford F-150
2004-2024On many F-150 models, the oil temperature sensor is located in the oil pan or near the oil filter adapter. Corrosion on the connector pins is a common issue due to exposure.
85% fixed by replacing sensor or repairing wiring
Chevrolet Silverado
2007-2024Silverado trucks often experience P0197 due to the sensor itself failing. Access can be challenging, sometimes requiring removal of other components for clearance.
80% fixed by replacing sensor
Honda Accord
2003-2024For Honda Accords, P0197 is frequently traced back to the oil temperature sensor. Wiring issues are less common but still occur, especially if the harness has been disturbed during other repairs.
85% fixed by replacing sensor or repairing wiring
Frequently Asked Questions
What does P0197 mean?
P0197 indicates that the engine computer is receiving a signal from the engine oil temperature sensor that suggests the oil is extremely cold, or there's an electrical fault in the sensor or its circuit.
Can I drive with P0197?
Yes, you can drive safely. This code typically does not cause immediate damage, but it can lead to reduced fuel economy and incorrect engine operation. Fix this within 1-2 weeks.
Will P0197 clear itself?
No, P0197 will not clear itself. The engine computer stores this code until the underlying electrical issue or faulty sensor is repaired and the code is manually cleared with a scan tool, or after several drive cycles if the fault is intermittent and resolves itself (which is rare for this code).
How do I fix P0197 myself?
Start by inspecting the sensor's wiring and connector for damage. If they look good, the most common fix is to replace the engine oil temperature sensor itself. You will need basic hand tools and possibly a jack and jack stands to access the sensor.
How much does it cost to fix P0197?
A DIY fix for P0197 typically costs $50-$100 for a new oil temperature sensor. If you take it to a shop, expect to pay $150-$300, which includes parts and labor.
P0197 keeps coming back - why?
If P0197 keeps returning, it points to either an intermittent wiring issue that wasn't fully resolved, a faulty replacement sensor, or a less common problem like a failing engine computer. Thoroughly re-inspect the wiring harness and connector for subtle damage.
Will P0197 fail emissions/smog test?
Yes, P0197 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and an incorrect oil temperature reading can affect fuel trim and emissions.
What's the difference between P0197 and P0198?
P0197 indicates a 'low input' from the oil temperature sensor, meaning the signal voltage is too low (suggesting extremely cold oil or an open circuit). P0198 indicates a 'high input,' meaning the signal voltage is too high (suggesting extremely hot oil or a short circuit).
P0197 on Ford F-150
On Ford F-150s, P0197 is most often caused by a failing oil temperature sensor. The sensor is usually located near the oil filter housing or in the oil pan. Wiring damage from road debris or corrosion is also a common factor, especially on older trucks.
Questions to Ask Your Mechanic
Did you test the resistance of the oil temperature sensor at different temperatures?
Good answer: Yes, I measured the resistance and compared it to the factory specifications. It was out of range, indicating a faulty sensor.
What did you find when you inspected the wiring harness to the sensor?
Good answer: I checked the entire length of the harness for chafing or breaks, and I inspected the connector pins for corrosion or looseness. Everything looked solid.
Repair Cost Estimate
DIY Repair
Parts only
$50-$100
Shop Repair
Parts + labor
$150-$300
Save $100-$200 by doing it yourself
Difficulty
intermediate
Time
1-2 hours
Intermediate - requires basic diagnostic tools like a multimeter and potentially lifting the vehicle for access. It's a good learning opportunity for those comfortable with basic automotive work.
Cost of Waiting
Ignoring P0197 can lead to your engine running rich, which wastes fuel and can eventually damage your catalytic converter. A $50-$100 sensor replacement now prevents a $1,200-$2,500 catalytic converter replacement later.
While You're In There...
If the sensor is located in the oil pan or requires draining oil for access, it's a good time to perform an oil change.
Cleaning the electrical connector terminals can resolve intermittent contact issues and ensure a solid connection for the new sensor.
Tools You'll Need
- Basic hand tools (wrenches, sockets)
- Multimeter
- Scan tool (to clear code)
- Jack and jack stands (for access)
- Oil drain pan (if sensor requires oil drain)
P0197 is a common sensor code. The repair is usually straightforward, and replacing the oil temperature sensor will get your engine running efficiently again.
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Your Next Steps
Step 1: Visually inspect the oil temperature sensor and its wiring. Look for frayed wires, corrosion on the connector, or a loose connection.
Step 2: If the visual inspection doesn't reveal an obvious issue, use a multimeter to test the sensor's resistance and check for proper voltage at the connector. Compare readings to your vehicle's service manual.
Step 3: If the sensor tests faulty or wiring is damaged, replace the engine oil temperature sensor or repair the wiring. You'll likely need a new oil temperature sensor.